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Arrays & Strings Is Unique Implement an algo. to determine if a string has all unique characters. What if you cannot use additional data structures ? Is given string ASCII or UNICODE, because if UNICODE will be there then we need to increase the array size. Sorting & then find continous elements Time Complexity - O(NlogN) Space Complexity - O(N) Comparing each char....

In old days we see that websites were not that much evolved. I would say Web Applications are just an evolved website, which uses somewhat more JS for making Websites more & more Interactive. And as providing users a better User Experience, there is need of managing data at clients browser. I would like to take example of React, but somewhat same thing applies to other Front-end frameworks, like Angular or Vue....